Complexes of lanthanide perchlorates with two new “O,N,O” ligands derived from antipyraldehyde and acetic and benzoic acid hydrazides

Jagannathan, R.; Soundararajan, S.

doi:10.1016/0020-1650(81)80028-1

Cited by 16 publications

(3 citation statements)

References 15 publications

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“…426, 8.456, 8.56 and 8.56 in complexes of yttrium chloride, yttrium bromide, lanthanum chloride and lanthanum bromide respectively. These results suggest the coordination of the azomethine nitrogen (Jagannathan and Soundararajan 1981) in the present complexes.…”

Section: Proton Nmr Spectrasupporting

confidence: 62%

Synthesis and physicochemical studies of the chloride and bromide complexes of yttrium and lanthanides with 4-N-(4′-antipyryl-methylidene)aminoantipyrine

Nair

Radhakrishnan

1995

Proc. Indian Acad. Sci. (Chem. Sci.)

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Twenty new complexes of chlorides and bromides of yttrium and lanthanides with the Schiff base 4-N-(4'-antipyrylmethylidene)aminoantipyrine (AA) have been prepared and characterised. They have the general formula, [Ln(AA)2CIa] and [Ln(AA)2Br2]Br where Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho and Er. Molar conductance studies indicate slight dissociation for the chloride complexes and 1:1 electrolytic behaviour for the bromide complexes. The magnetic moments of all the complexes agree well with Van Vleck values. The infrared spectra reveal that AA functions as a terdentate ligand in all these complexes coordinating through the oxygens of both the carbonyl groups and the azomethine nitrogen. Electronic spectra of Nd, Ho and Er for the chloride complexes and that of Pr, Nd, Ho and Er for the bromide complexes show weak covalency in the metal-ligand bond.

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Section: Proton Nmr Spectrasupporting

confidence: 62%

Synthesis and physicochemical studies of the chloride and bromide complexes of yttrium and lanthanides with 4-N-(4′-antipyryl-methylidene)aminoantipyrine

Nair

Radhakrishnan

1995

Proc. Indian Acad. Sci. (Chem. Sci.)

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“…The m(M-N) and m(M-O) stretching vibrations are observed at about 520 and 430 cm )1 , respectively in the spectra of the complexes [27]. The presence of the chloro bridge [28] is evident from the observation of two IR peaks at 270 and 280 cm )1 , which is a characteristic of chloro bridged binuclear complexes.…”

Section: Infrared Spectramentioning

confidence: 92%

Spectroscopic studies of bridged binuclear complexes of Co(II), Ni(II), Cu(II) and Zn(II)

Annigeri

Sathisha

Revankar

2007

Transition Met Chem

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Binuclear cobalt(II), nickel(II), copper(II) and zinc(II) complexes of general composition [M 2 L 1-2 (l-Cl)Cl 2 ] AE nH 2 O with the Schiff-base ligands (where L 1 H and L 2 H are the potential pentadentate ligands derived by condensing 2,6-diformyl-4-methylphenol with 4-amino-3-antipyrine and 2-hydroxy-3-hydrazinoquinoxiline, respectively) have been synthesized and characterized. Analytical and spectral studies support the above formulation. 1 H-NMR and IR spectra of the complexes suggest they have an endogenous phenoxide bridge, with chloride as the exogenous bridge atom. The electronic spectra of all the complexes are well characterized by broad d-d and a high intensity charge-transfer transitions. The complexes are chloro-bridged as evidenced by two intense far-IR bands centered around 270-280 cm )1 . Magnetic susceptibility measurements show that complexes are antiferromagnetic in nature. The compounds show significant growth inhibitory activity against fungi Aspergillus niger and Candida albicans and moderate activity against bacteria Bacillus cirroflagellosus and Pseudomonas auresenosa.

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“…Proton NMR spectra show the -CH--N-proton resonance at 8.356 in the pure ligand, at 8"556 in the yttrium complex, and at 8.66 in the lanthanum complex, with respect to TMS, suggesting coordination by the azomethine nitrogen (Jagannathan and Soundararajan 1981). The different band assignments are given in table 3.…”

Section: Infrared and Proton Nmr Spectramentioning

confidence: 98%

Synthesis and physicochemical studies of yttrium and lanthanide nitrate complexes of 1,2-(diimino-4′-antipyrinyl)ethane

Nair

Radhakrishnan

1996

Proc. Indian Acad. Sci. (Chem. Sci.)

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Yttrium and lanthanide nitrate complexes of the Schiff base, 1,2-(diimino-4'-antipyrinyl)ethane (GA), of the type [Ln(GA)2 (NO 3)a ] (where Ln = Y, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho or Er) have been synthesised and characterised by elemental analyses, electrical conductance, magnetic susceptibility, infrared, proton NMR and electronic spectra, and thermogravimetric studies. Infrared and proton NMR spectra of these complexes show that GA acts as a neutral tetradentate ligand and that all the three nitrate groups are coordinated monodentate!y. The electronic spectra of the Pr, Nd, Ho and Er complexes suggest reasonable covalency in the metal~ligand bond. The magnetic moments of these complexes are in agreement with the van Vleck values. All these complexes are thermally stable up to about 200°C. A coordination number of eleven may be assigned to the metal ions in these complexes.

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Complexes of lanthanide perchlorates with two new “O,N,O” ligands derived from antipyraldehyde and acetic and benzoic acid hydrazides

Cited by 16 publications

References 15 publications

Synthesis and physicochemical studies of the chloride and bromide complexes of yttrium and lanthanides with 4-N-(4′-antipyryl-methylidene)aminoantipyrine

Synthesis and physicochemical studies of the chloride and bromide complexes of yttrium and lanthanides with 4-N-(4′-antipyryl-methylidene)aminoantipyrine

Spectroscopic studies of bridged binuclear complexes of Co(II), Ni(II), Cu(II) and Zn(II)

Synthesis and physicochemical studies of yttrium and lanthanide nitrate complexes of 1,2-(diimino-4′-antipyrinyl)ethane

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